In this paper, we have discussed two problems:(1) the methodofrepresentation of strain energy density function in the stress and strain spaces;
本文主要解决的问题有两点：1、在应力空间和应变空间中表示应变能密度函数的方法；
2
In 1990s based on the eigenfunction methodofrepresentation theory of groups, a new method, the symmetrized boson representation (SBR) method, was brought forward.
90年代，陈金全等人在点群的表示理论上提出了一种新的方法，对称化玻色表象方法(SBR)。
3
The main work is listed below:(1) A self-adaptive selection methodofrepresentation is proposed. The validity of this method is proved by the simulation of function optimization.